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US 2007/0163466 A1Published application
Tungstate and molybate wood preservatives
AssigneeE.I. duPont de Nemours and Company
InventorsAlbert Anderson, John Feaster, Damini Patel, Mark Scialdone
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Abstract
Complexes of copper and/or zinc with molybdate and/or tungstate were solubilized in ammonia or ammoniacal solution providing preservative solutions that fully penetrate wood. With loss of the ammonia from the wood, the complexes were stably retained in the wood providing a long lasting preservative.
Claims30
An aqueous composition comprising in admixture (a) a complex comprising (i) molybdate ions, tungstate ions or a mixture thereof, and (ii) copper ions, zinc ions or a mixture thereof;
- and (b) ammonia and/or ethanolamine;
- wherein component (b) is present in an amount sufficient to solubilize the complex;
- and wherein a molybdate ion, when present in component (a), is present in the absence or substantial absence of a quaternary ammonium salt.
Dependencies are inferred from the claim text.